Question

An object A of mass 20kg moving with an initial velocity of 3m/s makes a head on collision with object B mass 10kg moving with a velocity of 2m/s in opposite direction if A and B stick together after collision calculate their common velocity

Answer 1

final momentum = initial momentum
(20+10) v = 20 * 3 - 10 * 2
30 v = 60 - 20

Answer 2

M1V1–(M2V2)=V(M1+M2)
20*3–(10*2)=V(20+10)
60–20=V(30)
40/30=30V/30
V=1.3ms–1.